Meperidine-hydroxyzine in obstetric analgesia.
D000293:Adolescent; D000328:Adult; D000773:Anesthesia, Obstetrical; D001007:Anxiety / Q000188:drug therapy; D002986:Clinical Trials as Topic; D005260:Female; D006801:Humans; D006919:Hydroxyzine; D008614:Meperidine; D010919:Placebos
D010919:Placebos; D006919:Hydroxyzine; D008614:Meperidine